Bolt heading and forging machine



(No Model.) 7 2 Sheets-'Sheet 1. M. 1). LUEHRS.

' BOLT HEADING AND FORGING MACHINE Patented Dec. 29, 18 91.

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(No Model.)

M. D. LUEHRS. BOLT H-EADING AND PORGIING MACHINE. 'No. 466,249. PatentedDec. 29, 18

Wan/eases I I Y avwemlfoi @Z/ M 2 $6004 5% 5% 2, we I v UNITED STATESPATENT OFFIC MICHEL D. LUEHRS, OF CLEVELAND, OHIO.

BOLT HEADING AND FORGING MACHINE.

SPECIFICATION forming part of Letters Patent No. 466,249, dated December29, 1891.

7 Application filed September 5,1890. Serial No- 364,094. (No model.) I

To all whom, it may concern/.2

Be it known that I, MIoHEL D. LUEHRS, a citizen of the United States,residing at Cleveland, in the county of Ouyahoga and State of Ohio, haveinvented certain new and useful Improvements in Bolt Heading and ForgingMachines, of which the following, with the accompanying drawings, is aspecification.

lVIy improvements relate to machines for heading bolts and forging metalfor various purposes.

The object of myinvention is an improved 4 pitman for connection betweenthe crank- .illustrate its internal construction.

shaft and the toggle mechanism, and also between the crank-shaft and theheading-slide forging-machines, whereby the throw of the togglemechanism may be regulated to close the gripping-dies and hold themclosed, as

desired, and also be adapted for use with the header-slide to regulatethe throw of the header-tool. \Vhen applied to the toggle mechanism, mypitman is especially adapted to the improvements patented to myself andDaniel S. Coe by Letters Patent No. 409,110, dated August 13, 1889. v

The invention consists in the novel construction and arrangement ofparts described herein and defined in the claims.

Figure 1 is a plan view of a forging-machine embodying my invention.Fig. 2 is an enlarged plan of myimproved pitman. Fig. 3 is a sideelevation of the same, part of the shell of the pitman being broken awayto Fig. 4 is an end view of Fig. 2. Fig. 5 is a longitudinal verticalsection through the line a: 00 of Fig. 1. Fig. 6 is a verticalcross-section of Fig. l on the line 2 2.

In the accompanying drawings, which form a part of this specification, Arepresents the main stand or bed of the machine.-

B is the crank-shaft.

C is the crank which operates the headerslide, and 0 is the crank whichoperates the toggle mechanism.

D is the pitman connecting the crank-shaft and the toggle mechanism, andD is the pitman which connects the crank-shaft and the header-slide.Both these pitmen are alike in construction.

E and F are sliding bars, which are driven reciprocally in slides in thebed .of the machine by means of the cranks O and C in connection withthe pitmen D and D.

G is a rock-arm pivoted in the supports H above the sliding bar E.

J is' the movable die, and J is the stationary die.

K is the sliding die-block.

L is a toggle-block, and M and M are the toggles.

For the sake of greater clearness, and that my present invention may bebetter under,- stood and distinguished from what is described in saidPatent No. 409,110, of August 13, 1889, I will first describe generallythe operation of said machine and then describe the present invention.

o The sliding bars E and F are driven recip-' rocally in ways on thebed-plate by means of the cranks O and O in connection with the pitmen Dand D. The sliding bar F sup- 7 ports the heading-tool and carries it toand from the dies J and J. The sliding bar E operates the mechanismwhich causes the movable die-block K, with the attached die J,

to approach to and recede from the stationary die J. The rock-arm G isshown in depressed position in Figs. 1 and 5. The sliding bar E hasinclines e and e" and plane surfaces e" and e' on its upper face. Im-

' mediately above the forward end of the bar E is loosely placed thetoggle-blockL, provided'with the toggles M and M. One of .these togglesM engages with the sliding die block .K. The other toggle M engages withthe adjacent side wall of the machine. The rock-arm G is pivoted abovethe bar E by means of supports on the bed of the machine. The front endof the rock-arm engages the 0 upper surface of the toggle-block L andthe opposite end engages the incline eon the bar E, said incline beingin reverse direction to the incline e", situated near the opposite endof said bar E. The function of said rock-arm 5 is to depressthe'toggle-block L when the sliding bar is on its back stroke. Planesurfaces e' and e" at the top and bottom of the incline e" sustain thetoggle-block L stationary at each end of the stroke of the bar E. Itwill be observed that the incline e on the upper face of the bar E assaid bar makes its forward stroke will raise the toggle-block L, and bymeans of the toggles M and M and the loose block K will throw the die Jto the die J. The crank C, which operates the toggle mechanism, is set alittle in advance of the crank O',which operates the header-slide. Theobject of this is to close the dies a little in advance of the stroke ofthe heading-tool. The plane surface e" while under the block L sustainssaid block stationary and keeps the die J close to the die J till theheadertool completes its stroke, when the bar E is withdrawn and therock-arm depresses the block L and opens the dies. It will be seen thatthe quicker the incline e is pushed under the block L and the furtherthe plane surface e is pushed under said block the quicker and longersaid block will be raised and sustained and so increase the length oftime the dies J and J are in gripped position. The converse is equallytrue-i. e.,.the later the incline e" is pushed under the block L and theshorter the distance the plane surface 6" is pushed under said block theshorter will be the time the dies are closed.

My present invention is directed to this pointnamely, to provide meansfor varying the time said dies will be closed. This is accomplished bymeans of a pitman, which may be increased or decreased in length, thusregu lating the time when the incline 6" will be forced under said blockL and the distance the plane surface 6" will he pushed under said block.

I will now describe in detail said adjustable pitman, which is mypresent invention. The matter is illustrated in detail in Figs. 2, 3,and t of the drawings.

The pitman consists of a shell d, having a female thread, and a stud at,having a male thread. The shell (Z is provided on its upper face withone or more cars a a, bored to admit the passage of bolts f and fthrough them, and said ears and shell are slotted through, as shown atc. The bolts f f are loosened and the stud d is screwed into theshelltillthepitmanismadetherequired length, when said bolts f and f aretightened. This construction makes it easy to adjust the pit man to thedesired length. Being made as strong and heavy as they are required tobe, some means is desirable for allowing the parts to screw togethereasily, and these means shown also aitords a way to tighten or take upthe wear of the thread. This construction may take on various changes ofdetail.

f in the figures represents part of the cap for securing the pitman tothe crank of the driving-shaft, and g is an eye for securing the pitmanto the slide E and F.

It will be seen that by lengthening the pitman, through which isoperated the toggle mechanism, the incline 2" will be pushed under thetoggle-block L and will push the plane surface 6"" a greater distanceunder said block, thus making the dies close quicker and remain longer,and that by shortening the pitman the dies will not be closed so quicklynor remain closed so great a length of time. This is important wheredifferent classes of work is made on one machine. 13y th us lengtheningand shortening the pitman, through which is operated the heading-tool,the distance of the extreme throw of said tool may be regulated forvarious kinds of work and allow more uniformity in the size of theheading-tools.

\Vhat I claim as my invention is 1. In a bolt-header, a pitman soadapted to be adjustable in length as that the die-closing mechanism ofthe machine and the length of the forward thrust of the heading-slidemay be varied as desired, substantially as shown and described.

2. In a bolt-header, a pitman consisting of a shell threaded interiorlyand slotted a portion of its length and a stud threaded to screw intosaid shell, and means for taking up the wear of the thread,substantially as described.

In testimony whereof I affix my signature, in presence of two witnesses,this 1st day of September, 1800.

MICHEL D. LUEIIRS.

Witnesses;

J. A. OSBORNE, II. S. SPRAGUE.

